For pictures with long focal lengths on cameras without a large bellows extension

While in studio photography, the most important domain of the large format, very long focal lengths are neither necessary nor useful, they are often used in landscape, nature, industrial, and architectural photography. Portrait photography, too, is an impor­tant area of application. The newly calculated, ex­tremely compact, light Apo-Tele-Xenar lenses, opti­mized in performance with new types of glass and through elaborate computer programs, are bringing some fresh air, as well as a contemporary level of quality, into the area of large-format telephoto pho­tography.

Apochromatic correction and high contrast make for brilliant long distance photographs without color fringes, which otherwise are especially clearly visible at long focal lengths, since the lateral chro­matic aberration without apochromatic correction is approximately proportional to the focal length. The short flange focal distance (the distance from the lens board to the focusing screen) resulting from the telephoto (barlow) design of the lens makes possible a focal length which is 30% to 40% longer than the maximum camera extension normally allows.

The Apo-Tele-Xenars 9/600 and 12/800 are modular, with an interchangeable rear component. They share the same front element, so that only the other rear component is required in addition to have both focal lengths available.